Launches the first or previous application while searching

When using the search lens, the first program shown or the last program searched for is sometimes launched instead of the program entered.

To reproduce:
 * Press Super to show the search lens
 * See 'Archive manager' as the first time
 * Quickly type 'xpad' and press enter
 * See Archive manager launch

You must do this before the search completes or the lens has time to update. It seems to launch the first item displayed when you press enter without waiting for the search to complete.

Note in this case I don't have xpad installed. I expected software center to launch but instead got archive manager.

I've had times where I launch Thunderbird using a search, close it, then try to launch something else later, and have Thunderbird (or what ever the last searched app) load.

You need a machine under load so that you can type faster than it can update.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.4.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.93-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,vpswitch,snap,compiztoolbox,resize,regex,animation,move,place,gnomecompat,mousepoll,grid,imgpng,unitymtgrabhandles,workarounds,session,wall,expo,fade,scale,unityshell]
Date: Thu Mar 8 13:42:48 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120219)
ProcEnviron:
 SHELL=/bin/bash
 TERM=xterm
 LANG=en_NZ.UTF-8
 LANGUAGE=en_NZ:en
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)